System and method for fault contactor detection

Details System and method for fault contactor detection System and method for fault contactor detection

2006-10-31

2006-10-31

Sircus, Brian (Department: 2836)

Electricity: electrical systems and devices

Safety and protection of systems and devices

Motor protective condition responsive circuits

Reexamination Certificate

active

07130170

ABSTRACT:
A motor starter system comprises solid state switches for connection to an AC line for controlling application of AC power to the motor. A fault contactor has contacts. A motor wiring circuit operatively connects the solid state switches and fault contactor contacts with motor winding terminals. A voltage sensor senses AC line voltage and motor terminal voltage. A control circuit controls operation of the solid state switches and the fault contactor, including de-energizing the fault contactor in an off mode where AC line power is not supplied to the motor winding terminals. The control circuit detects AC line voltage and motor terminal voltage in the off mode and detect an error condition responsive to sensed AC line voltage being substantially different from motor terminal voltage in the off mode.

REFERENCES:
patent: 4545464 (1985-10-01), Nomura
patent: 4681190 (1987-07-01), Toshiaki
patent: 5153489 (1992-10-01), Unsworth et al.
patent: 5341080 (1994-08-01), Agut Sanz
patent: 5684377 (1997-11-01), Kim et al.
patent: 6038114 (2000-03-01), Johnson
patent: 6201369 (2001-03-01), Johnson

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